<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
export default {
	data() {
		return {
			levelList: null,
		};
	},
	watch: {
		$route(route) {
			// If you go to the redirect page, do not update the breadcrumbs
			if (route.path.startsWith('/redirect/')) {
				return;
			}

			this.getBreadcrumb();
		},
	},
	created() {
		this.getBreadcrumb();
	},
	methods: {
		getBreadcrumb() {
			// Only show routes with meta.title
			let matched = this.$route.matched.filter(item => item.meta && item.meta.title);
			const first = matched[0];

			if (!this.isDashboard(first)) {
				matched = [{path: '/index', meta: {title: '首页'}}].concat(matched);
			}

			this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false);
		},
		isDashboard(route) {
			const name = route && route.name;
			if (!name) {
				return false;
			}

			return name.trim() === '首页';
		},
		handleLink(item) {
			const {redirect, path} = item;
			if (redirect) {
				this.$router.push(redirect);
				return;
			}

			this.$router.push(path);
		},
	},
};
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
